DID you see a spectacular upside-down rainbow over York on Friday evening?
If so, you weren't the only one!
Two readers have sent us these pictures, capturing the beautiful phenomenon - properly known as a circumzenithal arc.
Eight-year-old Milo took this photo from his garden in Poppleton at 6.15pm.
His mum emailed us the picture, and wrote: "There were two at once - truly rare! And he thought it was a huge smile in the sky."
Andy Gordon also captured the arc on camera, and sent us this photo, taken from near the New York Club in Blossom Street.
So what is it?
Circumzenithal arcs, which look like upside-down rainbows, are created by sunlight refracting through horizontal ice crystals in a certain way.
They are, in fact, fairly common - but they are usually too high to be seen.
The Met Office website states: "They are commonly associated with cirrus clouds where ice crystals readily form.
"In order to be able to see a circumzenithal arc, a combination of atmospheric conditions must coincide just right. The height, depth and position of the ice clouds must be right as the cloud needs to be at a specific angle convex to the sun. The position of the observer is also important since its visibility can vary greatly over short distances. "
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